[Ghitulescu]

I am afraid the Apple chargers are insanely expensive, so people not having an Apple and looking for an alternate (to Sony!!!) charger will not look at Apple products in the first place. Maybe they'll look at Sony chargers, for instance those for cameras or smartwatches or smartphones or other micro-USB (charging-enabled) appliances. This is what a normal consumer will do - check with the manufacturer. Sony is also expensive.

Whether an Apple charger will work or not is per se however a good info.
Another good info is that ANY charger delivering 5V to 500-1000mA (not more) will charge any micro-USB gear (that supports charging via USB) if the cable is "prepared", by connecting both data lines via a resistor not greater than 200 ohm. A simple short will suffice.

That's the big deal.
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Now, a few manufacturers use some tricks to let the charger go beyond the standard 500mA current. But this is not an issue with "older" generation devices.